import java.io.*;
import java.util.Scanner;

public class Demo12 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要拷贝的文件路径：");
        String srcPath = sc.next();
        System.out.println("请输入要拷贝到的目标路径：");
        String destPath = sc.next();

        File srcFile = new File(srcPath);
        if(!srcFile.isFile()){
            System.out.println("要拷贝的文件路径非法！");
            return;
        }
        File destFile = new File(destPath);
        if(!destFile.getParentFile().isDirectory()){
            System.out.println("要拷贝的目标路径非法！");
            return;
        }

        try(InputStream inputStream = new FileInputStream(srcPath);
            OutputStream outputStream = new FileOutputStream(destPath)){
            while(true){
                byte[] bytes = new byte[1024];
                int n = inputStream.read(bytes);
                if(n == -1) break;
                outputStream.write(bytes,0,n);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
